X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=cctools%2Flib%2Fcp-usb.c;fp=cctools%2Flib%2Fcp-usb.c;h=530848db1cd50bbad8c014bab9019100d56c7f8d;hp=0000000000000000000000000000000000000000;hb=208bc15714c7b4020c017eef19011c4eb9ab51e2;hpb=17d2432a8b9c15963cd3b821f025ad33972ef477

diff --git a/cctools/lib/cp-usb.c b/cctools/lib/cp-usb.c
new file mode 100644
index 00000000..530848db
--- /dev/null
+++ b/cctools/lib/cp-usb.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright © 2008 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+/*
+ * libusb interface to the GPIO pins on a CP2103.
+ *
+ * Various magic constants came from the cp210x driver published by silabs.
+ */
+
+#include "cp-usb.h"
+#include <stdio.h>
+#include <errno.h>
+#include <libusb.h>
+
+struct cp_usb {
+	usb_dev_handle *usb_dev;
+	uint8_t	gpio;
+};
+
+#define CP2101_UART	0x00
+#define UART_ENABLE	0x0001
+#define UART_DISABLE	0x0000
+#define REQTYPE_HOST_TO_DEVICE  0x41
+#define REQTYPE_DEVICE_TO_HOST  0xc1
+
+static int
+cp_usb_gpio_get(struct cp_usb *cp, uint8_t *gpio_get)
+{
+	return usb_control_msg(cp->usb_dev,		/* dev */
+			       0xc0,			/* request */
+			       0xff,			/* requesttype */
+			       0x00c2,			/* value */
+			       0,			/* index */
+			       (char *) gpio_get,	/* bytes */
+			       1,			/* size */
+			       300);			/* timeout */
+}
+
+static int
+cp_usb_gpio_set(struct cp_usb *cp, uint8_t mask, uint8_t value)
+{
+	uint16_t gpio_set = ((uint16_t) value << 8) | mask;
+
+	return usb_control_msg(cp->usb_dev,		/* dev */
+			       0x40,			/* request */
+			       0xff,			/* requesttype */
+			       0x37e1,			/* value */
+			       gpio_set,		/* index */
+			       NULL,			/* bytes */
+			       0,			/* size */
+			       300);			/* timeout */
+}
+
+static int
+cp_usb_uart_enable_disable(struct cp_usb *cp, uint16_t enable)
+{
+	return usb_control_msg(cp->usb_dev,
+			       CP2101_UART,
+			       REQTYPE_HOST_TO_DEVICE,
+			       enable,
+			       0,
+			       NULL,
+			       0,
+			       300);
+}
+
+struct cp_usb *
+cp_usb_open(void)
+{
+	struct cp_usb *cp;
+	usb_dev_handle *dev_handle;
+	struct usb_device *dev = NULL;
+	struct usb_bus *bus, *busses;
+	int interface;
+	int ret;
+	uint8_t gpio;
+
+	usb_init();
+	usb_find_busses();
+	usb_find_devices();
+
+	busses = usb_get_busses();
+	for (bus = busses; bus; bus = bus->next) {
+		for (dev = bus->devices; dev; dev = dev->next) {
+			if (dev->descriptor.idVendor == 0x10c4 &&
+			    dev->descriptor.idProduct == 0xea60)
+				break;
+		}
+		if (dev)
+			break;
+	}
+	if (!dev){
+		perror("No CP2103 found");
+		return NULL;
+	}
+	cp = calloc(sizeof(struct cp_usb), 1);
+	interface = 0;
+	dev_handle = usb_open(dev);
+	usb_detach_kernel_driver_np(dev_handle, interface);
+	usb_claim_interface(dev_handle, interface);
+	cp->usb_dev = dev_handle;
+	ret = cp_usb_uart_enable_disable(cp, UART_DISABLE);
+	cp->gpio = 0xf;
+	ret = cp_usb_gpio_set(cp, 0xf, cp->gpio);
+	ret = cp_usb_gpio_get(cp, &gpio);
+	return cp;
+}
+
+void
+cp_usb_close(struct cp_usb *cp)
+{
+	cp_usb_uart_enable_disable(cp, UART_DISABLE);
+	usb_close(cp->usb_dev);
+	free(cp);
+}
+
+void
+cp_usb_write(struct cp_usb *cp, uint8_t mask, uint8_t value)
+{
+	uint8_t	new_gpio;
+	int ret;
+
+	new_gpio = (cp->gpio & ~mask) | (value & mask);
+	if (new_gpio != cp->gpio) {
+		ret = cp_usb_gpio_set(cp, new_gpio ^ cp->gpio, new_gpio);
+		if (ret < 0)
+			perror("gpio_set");
+		cp->gpio = new_gpio;
+	}
+}
+
+uint8_t
+cp_usb_read(struct cp_usb *cp)
+{
+	int ret;
+	uint8_t gpio;
+
+	ret = cp_usb_gpio_get(cp, &gpio);
+	if (ret < 0)
+		perror("gpio_get");
+	return gpio;
+}